About 30% of distributed solar capacity is owned by third parties

Distributed solar capacity in the United States, which includes all solar power capacity other than utility-scale installations 1 MW or larger, totaled 12.3 gigawatts (GW) as of September. About 30% of that amount (3.7 GW) was owned by third-party owners. Third-party owners are private companies that provide either solar electricity or equipment to generate it to building owners or tenants, typically with little or no upfront costs.
Source: Today In Energy